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Only 25km from Trieste across the Schengen border with Slovenia. No public transport for a return trip, but can be done by car/taxi/bike.
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There are buses from Trieste to Poreč that take about 2 hours one way. You'll visit 3 countries, but all are part of the Schengen Area.
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Palmanova (45min)
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About 1.5 hours by regular bus
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Idrija lies across the Schengen border with Slovenia. Trains take 2h30
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An hour by train/bus